The primary chemical component found in the human body is water, comprising about 60% of body weight. Water is essential for various physiological processes, serving as a solvent for biochemical reactions, regulating temperature, and facilitating nutrient transport. Following water, other major components include proteins, lipids, carbohydrates, and nucleic acids, all of which play critical roles in maintaining life. Understanding the chemical composition of the human body is fundamental to fields such as biology, medicine, and nutrition.